Hi i also have the same error code (12/22) with a sony plasma PFM500-AW2E, i don't use the screen anymore because it would just power off every 5 minutes with the error codes on the side. i found the meaning of the error codes on a different forum, it is indeed related to some voltage problem... (i will try to post the URL here) If you have these codes it doesn't look good because someone said it not worth fixing it for that price (couple of thousand dollars).

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